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Definition df-mnf 9652
Description: Define minus infinity as the power set of plus infinity. Note that the definition is arbitrary, requiring only that be a set not in and different from (see mnfnre 9657 and pnfnemnf 11355). (Contributed by NM, 13-Oct-2005.) (New usage is discouraged.)
Assertion
Ref Expression
df-mnf

Detailed syntax breakdown of Definition df-mnf
StepHypRef Expression
1 cmnf 9647 . 2
2 cpnf 9646 . . 3
32cpw 4012 . 2
41, 3wceq 1395 1
Colors of variables: wff setvar class
This definition is referenced by:  mnfnre  9657  mnfxr  11352  pnfnemnf  11355
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